Method of melting manganese steel



manganese wmmmmm-ms-w EIEAN E-Hll" To all whom may concern r, m 1 w fT-no it moon int muster a. \lbIIOLs, c citizen of the United States,residing at llhicego Heights, in. the county of Cool: and

:uess steel objects, and. has for its purpose reduce the loss ofmanganese in the of melting the steel scrap.

The increased availability of manganese steel scrap as a commercialproduct, and the r naively high cost oi obtaining manganese l by the ofterm-manganese, o *oruloined to render "very important the every teconomical methods in the resign)? manganese steel withoutexcesof itscontent. Imporodrsnces toward end have been --e, in the adoption oi theelectric furnace i relatively atmosphere; in the stood of. conductingthe. heat which rethe duration of time to minimum hath is at or caltemperature bec'drawing the charge; and in special atiren to thechemical constituency is prt nine slag; Wuich covers the oath. notw'hstendiug these precautions, iul as they are, the loss of manganesecited msntranese steel as practiced s present i en'tion has been excesiin the perisnce of some loundis the practice of manganese steel scrapand induced i uurn to the practice of combining ferropnnese with lowcarbon steel by depositt into the ladle at the time of drawing Jest. Norcan the excessive loss of men- 7 so from manganese steel scrap he set-.ctorily compensated by the addition of @111811Q2L36S8 to the meltcdscmpbecause the excessive Cfll'llOll constituent in the route manganesestool resulting from the addition of the carbon. unavoidably present inthe i erroonanganesc to that already presin remaining with the steelscrap.

loss of manganese trom melted scrap, course, occu s loy the process ofoxidation. s has been satisfactorily controlled in the 7 hath by the useof a basic ootning and by cure in building up the :1 his hlaulcet slog.But the loss steel scrap lor'casting into inun- "53 G. ETEIGHGLE, SIQ'JEICAGO HEIGHTS, ILLINUIS, ASSIGNOR TO AMERICAN !l CUZliITlANlZ', OFCHIGAGO, ILLINOIS, A CORPORATION OF MAINE.

233 103 F MEETING MANGANESE STEEL.

Application filed liecemher '7, 1922. Serial No 605,512.

resulting from the passage of manganese oxide into the slug: has notheretofore been satisfactorily prevented For the reason that in spite ofell'orts to maintain basic conditions in the slug. combining of thereadily oxidizable manganese has taken place, and in spite of the use ofcurlrouiferous reagents upon the slug, the manganese has becomeirretrievuhly incorporated therein.

Now, the present invention avoids the dif-, ficulties recited andprovides a method- Wherehy manganese steel scrap can be successfully andeconomically melted for reuse as manganese steel, and a steel of greatpurity and high physical character obtained. The underlying feature ofthe invention consists in melting steel containing manganese, in afurnace that is not only rendered usbasic and as free fromoxygenloearing environment-us practicable, out is provided with 21-readily .oxidizalole ingredient nt the level of and preferably alsoshove the slug that takes up the oxygen of i the slag or that containedin acid or other oxidizing influences thereof, and leaves the slag morenearly neutral and the greater portion of manganese which enters theslag free to return to the bath.

The readily oxioliheble ingredient is preferably iron in mete. lic form,but it may be any metalliierous suhstance having a sufiicieut sltinityfor oxygen and not incompati hie Withvthe desired formula of the hath.

Again, the metal. or metalhferous lngreclient is preferably incorporatedin the lining of the furnace and particularly that pert of the liningwhich surrounds and lies shove the slag. The roof also will prefcrohlybe lined With basic material, although not necessarily withmetalliferous material.

A convenient method of bringing metal into the descriloed relation tothe slag covering of a loath of manganese steel in in electric arcfurnace is to line the furnace or at least thoseparts of the furnacewhich are critical tothe present process, with material commerciallyknown as metalkasc brick, which consists of a sheet metal jacket ofapproximately rectangular section filled with magnesite (lime andmagnesia), in such a manner that the edges of the sheet metal jacketsare exposed to the heat of the furnace, and melt and run down into theslag in quantity suliicient to neutralize the above 'sfieel castings,which consists oxidizing influence in the slag. Run the rosult may alsobe obtained, at least to n measurably boneficial by oiliorwiseincorporating iron in metallic state with tho lining brick.

The e'ifect of the iron clad brick or rick otherwise associated W. l1.the iron is not merely that incident to i iio basic nature of the liningthus insured; ii; is not to insuro neutrality in the eilcot of thelining, lwui: to lend a positively rcuctivo element at and the level ofthe slug,

l". claim:

L The iniprovemmit in The art of melting manganese steel scrap to produ'ningrnneso .n sulij in the steel scrap io fusing temperature in a arelatively inert oi'ivironmcnt and under i'llS protection of a. coveringof Wllill, providing at or above the lorci of readily oxiclizalilonwtnlliforou subsmnco ilio n not incompatible with the formulaof fihebath.

2. The iin n'oveineni in the art of melting manganese steel scrup,'an(lconserving therein the contained manganese; the same consisting insubjecting; the manganese steel scrap to fusing renmeratnrc in annir-excl11ding furnace, and under H16 protection of a covering of slug;while providing iron at or above iiic level oi the slug. i

Tlic iinproroment in the uri: of inoiting inunganoso steel scrap toproduce manganese oiecl castings, lilo same consisting i subjcciing in?steel scrap to fusing temperature. with exclusion of nhnosplicre. andWhile henoafi-li u proicctivo (overing of slag, ungi surrounded by aWall composed-in part of iron exposed upon i'llC: inner surface 01"" theWall. inncd at OlliCrRQ'O Illinois, this 29th day of NOVI'IlbOR", 19252.

l-VlFlSLiY NICHGLS.

